Shuttle-driving mechanism for sewing-machines.



P. SJOSTROM.

SHUTTLE DRIVING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED MAR127I I9l5.

Patented May 1, 1917. 3 SHEETS-SHEET I Wfimssw. M 4 Mw and @w P. SIOSTROIVI.

SHUTTLE DRIVING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED MAR. 27; I915.

Patented May 1, 1917.

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P. SJOSTROM.

SHUTTLE DRIVING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED MAR.27. I9I5.

1,22,226. Patented May 1, 1917.

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PETER SJ'OSTROM, OF MAPLEWOOD, MASSACHUSETTS, ASSIGNOR TO VICTOR SHOE MACHINERY COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

SHUTTLE-DRIVING MECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented May 1, 1917.

Original application filed February 17, 1915, Serial No. 9,465. Divided and this application filed March 27,

1915. Serial No. 17,941.

To all whom it may concern:

Be it known that 1, PETER SJos'rRoM, a subject of the King of Sweden, and a resident of Maplewood, in the county of Middlesex and State of Massachusetts, have invented certain new and useful' Improvements in Shuttle-Driving Mechanisms for Sewing-Machines, of which the following is a specification.

This invention relates to mechanisms for operating the shuttle in machines for sewing heavy material such as leather, and particularly to that class of machines known as welt sewing. machines, the present application being a division of another application of mine filed Feb. 17, 1915, and numbered 9A65.

The object of the present invention is to provide a simple and effective mechanism for operating the shuttle, which will drive the shuttle more rapidly than the needle when the under thread is to be removed from the needle barb by the shuttle hook, both the needle and shuttle hook moving in the same direction during the thread removing operation.

Another object of the invention is to provide means for forcing the shuttle thread away from the awl so as to effectually prevent entanglement therewith during the operation of the machine.

WVhile shuttles have been oscillated heretofore in sewing machines, it is believed to be new to oscillate a shuttle by means of a lever to which oscillatory movement is imparted by means of a member mounted upon a rock shaft and adjustable about the axis of said shaft.

It is also new to provide the shuttle operating lever with a curved extension and with a cam groove therein engaged by a projection extending from a lever mounted on and oscillating with a rock shaft whereby during a portion of the movement of said projection in said groove the shuttle will have imparted thereto a rapidly increasing or decreasing speed, while during another portion of the movement of said projection the shuttle will be retained at rest.

Another novel feature of the present invention is the provision of means in a ma.- chine having an oscillating barbed needle and a shuttle oscillating in a plane perpendicular to the direction of feed of the work being operated upon whereby the shuttle may be driven more rapidly than the needle when the under thread is to be removed from the needle barb, or in other words, to accelerate the speed of the shuttle while its hook is removing the thread from the barb of a needle moving in the same direction as said shuttle.

A further feature of novelty in the present application is the provision on the shuttle drive of a lateral projection having an enlarged head in advance of the shuttle hook, which projection and head are provided with a curved cam surface which is adapted to engage the shuttle thread when it has been passed through the loop of under thread and force this thread and loop away from the awl on its upward movement through the work.

Except these novel constructions above referred to the remainingparts of the machine shown and described in the present application are old in other machines or are covered in other applications of mine divided out of the application above referred to or in said parent application itself.

The invention consists in certain novel features of construction and arrangement of parts which will be fully understood by reference to the description of the drawings and to the claims hereinafter given.

Of the drawings:

Figure 1 represents an elevation of a machine embodying the principles of the present invention.

Fig. 2 represents an elevation of the shuttle, its casing, and its driving member.

Fig. 3 represents a section of the same, the cutting plane being on line 33 on Fig. 2.

Fig. 4 represents a front elevation of a portion of the same, showing the means for forcing the thread away from the awl.

Fig. 5 represents a transverse section through the shuttle,

Fig. 6 represents a sectional detail of the devices for giving the oscillating driving shaft a standstill at the end of its movement in either direction, and

Fig. 7 represents a vertical section of the lating the needle.

Similar characters designate like parts throughout the several figures of the drawings.

In the drawings, 19 is a connector, the lower end of which is connected to any wellknown form of driving mechanism, while the upper end is pivotally connected to a lever 20 mounted upon a stud 21 nonrevolubly mounted in a boss in the frame 23, the base 24 of which is adapted to be secured to any well-known form of support.

The lever 20 is secured by means of the bolt 26 to the gear segment 27, the hub 28 of which is mounted upon the stud 21 about the axis of which it is adapted to be oscillated. The teeth of the gear segment 27 mesh with the teeth of the gear 29 secured to a shaft 30 mounted in bearings in the frame 23, in which bearings said shaft is adapted to be oscillated by means of the gear segment 27.

The shaft 30 has loosely mounted thereon a disk member 31 having formed thereon radial shoulders 3233 which are adapted to .be engaged by a pin 34 extending laterally from the gear 29. This pin 34, during the oscillation of the gear 29, will impart movement to the disk 31 when contacting with either of the shoulders 32-33, while permitting said disk to remain at a standstill at the beginning of the movement of said pin 34 in either direction, that is, while traveling from the shoulder 32 to the shoulder 33 or vice versa.

The machine is provided with the usual oscillating awl 41 and barbed needle 47. The needle 47 is mounted in the carrier adapted to be oscillated about a fixed stud 47 X by means of a connector 106 one end of which is pivotally connected to the end of the radial arm 45 on the needle carrier 45 while its opposite end is pivotally connected at 105* to the disk 105 secured to and 0scillating with the shaft 30.

Any oscillating movement of the shaft30 will be imparted to the needle carrier 45 and the needle 47 carried thereby. The shaft 30 extends beyond the left hand side of the machine and has adjustably secured thereto the arm 134 having a truck 135 at its outer end positioned in a. cam groove 136 formed in a curved arm 137 of a lever 138. This lever 138 is pivoted at 139 and is provided with an oppositely extending arm 140 having formed on its outer end a gear segment 141. The teeth of this gear segment 141 engage the teeth of the pinion 142 secured to a shaft 143 formed upon the shuttle drive 144, having a shuttle engaging projection 172. The shuttle 145, provided with the usual hook, is mounted in a suitable fixed raceway 146 having pivoted thereto, at 147, a cap 148 which is adaptedto be locked by a bolt 149. By moving the bolt 149 outwardly the end thereof will be disengaged from the cap 148, thereby permitting it to be moved upwardly about the pivot 147 to allow the shuttle to be removed from the raceway 146.

The cam groove 136 in the arm 137 of the shuttle driving lever is so constructed that .the awl in its upward movement and making it necessary to use short awls and change these awls for various thicknesses of material so that the point thereof will protrude but slightly above the surface of the work.

To overcome this difficulty the shuttle driver is provided with the lateral projection 172 having an enlarged head with a curved cam surface which will engage with the thread during the stitch forming operation and force it away from the awl, there by preventing any entanglement therewith. The head of the projection 172 fits into a recess in the periphery of the shuttle 145 and serves to oscillate said shuttle during the oscillations of the driver 144 of which said projection 172 forms a part. The head of the projection 17 2 flares outwardly from the shank connecting it to the driver 144 in every direction except toward the axis of said driver and when the thread is engaged by said curved surface it is forced down the shank toward the driver 144 into a position where it cannot be jammed between the head of said projection and the wall of the recess in said shuttle.

The cam projection 172 is in advance of the hook on the shuttle and is adapted to engage the thread t when it has been passed through the loop of under thread drawn through the work and force this thread and the loop away from the awl on its upward movement through the work, all as shown in Fig. 4 of the drawings. This cam projection 172 is of considerable importance, for by its use the entanglement of the thread with the awlis wholly obviated, making it possible to use any desired length of awl,

and does away with the necessity of changing awls for various thicknesses of material.

The shuttle thread t in a coil is placed in the receptacle 150 therefor and passes outwardly through the hole 174 in one wall of the shuttle, along the outer face of said wall to the hole 175 through which it passes inwardly into the recess 150, and then to the hole 17 6 to the outer wall of the shuttle and thence to the work.

It is believed that the operation and many advantages of this machine will be fully understood from the foregoing description.

Having thus described my invention, I claim:

1. In a machine of the class described, the combination of a shuttle; a driving member therefor having a shaft extending laterally therefrom; a pinion secured to the outer end of said shaft; a pivoted lever having a gear segment meshing with said pinion; a rock shaft; and means thereon for imparting an oscillatory movement to said lever and adjustable about the axis of said rock shaft.

2. In a machine of the class described, the combination of a shuttle; a driving member therefor having a shaft extending laterally therefrom; a pinion secured to the outer end of said shaft; a pivoted lever having a gear segment meshing with said pinion and provided with a curved extension having a cam groove therein; a rock shaft; and an arm thereon provided with a projection extending into said groove for imparting an oscillatory movement to said pivoted lever.

B. In a machine of the class described, the combination of a shuttle; a driving member therefor having a shaft extending laterally therefrom; a pinion secured to said shaft; a. pivoted lever having a gear segment meshing with said pinion; a rock shaft; and means adjustably mounted thereon engaging said lever and imparting thereto an oscillatory movement, the part of said pivoted lever engaged by said engaging means being so constructed as to provide a standstill of said pivoted lever during the oscillation of said lever engaging means.

a. In a machine of the class described, the combination of a shuttle; a driving member therefor having a shaft extending laterally therefrom; a pinion secured to the outer end of said shaft; a pivoted lever having a gear segment meshing with said pinion and on Copies of this patent may be obtained for the opposite side of its pivot with a cam groove having a straight radial portion and a curved portion; a rock shaft; and an arm thereon provided with a projection engaging said cam groove.

5. In a machine of the class described, the combination of a shuttle; a driving member having a shaft extending laterally therefrom; a pinion secured to the outer end of said shaft; a rock shaft; an arm secured thereto and having a projection at its outer end; and a pivoted lever having at one end a gear segment meshing with said pinion and at its other end an arm having a straight groove to receive said projection and terminating in a curved portion concentric to the axis of said rock shaft when said grooved arm is in its lowest position.

6. In a machine of the class described, the combination of a shuttle; a driving member therefor having a shaft extending laterally therefrom; a pinion secured to the outer end of said shaft; a rock shaft; an arm secured thereto and having a projection at its outer end; a pivoted lever having at one end a gear segment meshing with said pinion and at its other end an arm having a straight groove to receive said projection and terminating in a curved portion concentric to the axis of said rock shaft when said grooved arm is in its lowest position; and means for adjusting said arm relatively to said rock shaft. I

7 In a machine of the class described, the combination with an oscillating awl, of a shuttle having a hook; a driving member therefor; and a lateral projection thereon in advance of the shuttle hook having an enlarged head and provided with a curved cam surface adapted in its movement to force the thread out of the path of the awl.

Signed by me at Boston, Mass, this 17th day of March 1915.

PETER SJOSTROM.

Witnesses:

WALTER E. LoMBARD, NATHAN C. LOMBARD.

five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

